^{2}-b

^{2 }problem.

factorise each of the following expressions completely

a) 6x^2y^2-5xy-4

b) 3z-8xyz+4x^2y^2z

c) 36y^2-49(x+1)^2

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Marked as Best Answer

If you rewrite the problems and substitute x*y by t for example, you'll get a quadratic equation.

for b) part you have the same after factoring out z.

c) part is a^{2}-b^{2 }problem.

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## Comments

^{2}- 5t - 4 = 0